Working features
- ✓Support for private servers like Akatsuki, EZPPFarm, Ripple
- ✓Multiplayer lobbies, chat
- ✓Automatic map downloads
- ✓Online leaderboards, including score submission*
- ✓Recording and viewing replays
- ✓Low-latency audio
Missing features
- 𐄂Player list (F9 menu)
- 𐄂Spectating/getting spectated
You can see what I'm planning to work on in more detail here.